Dynamically Size Elements with Pure CSS - Fullscreen scrolling fixed elements

<!DOCTYPE html>
<html>

  <head>
    <link rel="stylesheet" href="style.css">
  </head>

  <body>
    <section>
      <p>Cronut hexagon neutra retro, iceland paleo snackwave food truck.</p>
    </section>
    <section>
      <p> Listicle taxidermy, vinyl VHS gastropub poutine, chambray kombucha.</p>
    </section>
    <section>
      <p>Lomo iPhone DIY, knausgaard echo park shabby chic trust fund.</p>
    </section>
    <section>
      <p>Salvia beard pour-over selvage four dollar toast semiotics.</p>
    </section>
  </body>

</html>

section {
  width: 100vw;
  height: 100vh;
  
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

section:nth-of-type(1) { 
  background-image: url('https://unsplash.it/1024/683?image=1068');
}

section:nth-of-type(2) { 
  background-image: url('https://unsplash.it/1024/683?image=1073');
}

section:nth-of-type(3) { 
  background-image: url('https://unsplash.it/1024/683?image=1047');
}

section:nth-of-type(4) { 
  background-image: url('https://unsplash.it/1024/683?image=1032');
}

















/* Demo styles only */
body {
  margin: 0;
  font-family: monospace;
}

p {
  margin: 0;
  font-size: 2rem;
  padding: 0 5rem;
  text-shadow: 1px 1px #333;
  color: #fff;
}